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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ParseContext.html 906 2014-07-30 00:09:06Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.string;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.regex.Matcher;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.regex.Pattern;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>/**<a name="line.13"></a>
<span class="sourceLineNo">014</span> * Utility class supporting parsing of strings.<a name="line.14"></a>
<span class="sourceLineNo">015</span> *<a name="line.15"></a>
<span class="sourceLineNo">016</span> * &lt;p&gt;<a name="line.16"></a>
<span class="sourceLineNo">017</span> * Instances of this class are not thread safe.<a name="line.17"></a>
<span class="sourceLineNo">018</span> * &lt;/p&gt;<a name="line.18"></a>
<span class="sourceLineNo">019</span> */<a name="line.19"></a>
<span class="sourceLineNo">020</span>public class ParseContext implements Cloneable {<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>    private static final int MAX_REJECT_QUOTE = 15;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    private final String input;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    private int index;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    /**<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * Constructor.<a name="line.29"></a>
<span class="sourceLineNo">030</span>     *<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * @param input the input string to parse<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * @throws IllegalArgumentException if {@code input} is null<a name="line.32"></a>
<span class="sourceLineNo">033</span>     */<a name="line.33"></a>
<span class="sourceLineNo">034</span>    public ParseContext(String input) {<a name="line.34"></a>
<span class="sourceLineNo">035</span>        if (input == null)<a name="line.35"></a>
<span class="sourceLineNo">036</span>            throw new IllegalArgumentException("null input");<a name="line.36"></a>
<span class="sourceLineNo">037</span>        this.input = input;<a name="line.37"></a>
<span class="sourceLineNo">038</span>    }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    /**<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * Get the original input string as passed to the constructor.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @return original input string<a name="line.43"></a>
<span class="sourceLineNo">044</span>     */<a name="line.44"></a>
<span class="sourceLineNo">045</span>    public String getOriginalInput() {<a name="line.45"></a>
<span class="sourceLineNo">046</span>        return this.input;<a name="line.46"></a>
<span class="sourceLineNo">047</span>    }<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    /**<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * Get the current input.<a name="line.50"></a>
<span class="sourceLineNo">051</span>     *<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * @return substring of the original input string starting at the current parse position<a name="line.52"></a>
<span class="sourceLineNo">053</span>     */<a name="line.53"></a>
<span class="sourceLineNo">054</span>    public String getInput() {<a name="line.54"></a>
<span class="sourceLineNo">055</span>        return this.input.substring(this.index);<a name="line.55"></a>
<span class="sourceLineNo">056</span>    }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>    /**<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * Get the current index into the original input string.<a name="line.59"></a>
<span class="sourceLineNo">060</span>     *<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * @return current parse position<a name="line.61"></a>
<span class="sourceLineNo">062</span>     * @see #setIndex<a name="line.62"></a>
<span class="sourceLineNo">063</span>     */<a name="line.63"></a>
<span class="sourceLineNo">064</span>    public int getIndex() {<a name="line.64"></a>
<span class="sourceLineNo">065</span>        return this.index;<a name="line.65"></a>
<span class="sourceLineNo">066</span>    }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>    /**<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * Set the current index into the original input string.<a name="line.69"></a>
<span class="sourceLineNo">070</span>     *<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * @param index new parse position<a name="line.71"></a>
<span class="sourceLineNo">072</span>     * @throws IllegalArgumentException if {@code index} is greater than the original string length<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * @see #getIndex<a name="line.73"></a>
<span class="sourceLineNo">074</span>     */<a name="line.74"></a>
<span class="sourceLineNo">075</span>    public void setIndex(int index) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>        this.index = index;<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    /**<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * Reset this instance. This instance will return to the state it was in<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * immediately after construction.<a name="line.81"></a>
<span class="sourceLineNo">082</span>     *<a name="line.82"></a>
<span class="sourceLineNo">083</span>     * &lt;p&gt;<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * This method just invokes:<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * &lt;blockquote&gt;<a name="line.85"></a>
<span class="sourceLineNo">086</span>     *  &lt;code&gt;setIndex(0)&lt;/code&gt;<a name="line.86"></a>
<span class="sourceLineNo">087</span>     * &lt;/blockquote&gt;<a name="line.87"></a>
<span class="sourceLineNo">088</span>     */<a name="line.88"></a>
<span class="sourceLineNo">089</span>    public void reset() {<a name="line.89"></a>
<span class="sourceLineNo">090</span>        this.setIndex(0);<a name="line.90"></a>
<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    /**<a name="line.93"></a>
<span class="sourceLineNo">094</span>     * Match the current input against the given regular expression and advance past it.<a name="line.94"></a>
<span class="sourceLineNo">095</span>     *<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * @param regex regular expression to match against the current input<a name="line.96"></a>
<span class="sourceLineNo">097</span>     * @throws IllegalArgumentException if the current input does not match<a name="line.97"></a>
<span class="sourceLineNo">098</span>     */<a name="line.98"></a>
<span class="sourceLineNo">099</span>    public Matcher matchPrefix(String regex) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>        return this.matchPrefix(Pattern.compile(regex));<a name="line.100"></a>
<span class="sourceLineNo">101</span>    }<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>    /**<a name="line.103"></a>
<span class="sourceLineNo">104</span>     * Match the current input against the given regular expression and advance past it.<a name="line.104"></a>
<span class="sourceLineNo">105</span>     *<a name="line.105"></a>
<span class="sourceLineNo">106</span>     * @param regex regular expression to match against the current input<a name="line.106"></a>
<span class="sourceLineNo">107</span>     * @throws IllegalArgumentException if the current input does not match<a name="line.107"></a>
<span class="sourceLineNo">108</span>     */<a name="line.108"></a>
<span class="sourceLineNo">109</span>    public Matcher matchPrefix(Pattern regex) {<a name="line.109"></a>
<span class="sourceLineNo">110</span>        final Matcher matcher = this.tryPattern(regex);<a name="line.110"></a>
<span class="sourceLineNo">111</span>        if (matcher == null)<a name="line.111"></a>
<span class="sourceLineNo">112</span>            throw buildException("expected input matching pattern `" + regex + "'");<a name="line.112"></a>
<span class="sourceLineNo">113</span>        return matcher;<a name="line.113"></a>
<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>    /**<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * Determine if the current input starts with the given literal prefix.<a name="line.117"></a>
<span class="sourceLineNo">118</span>     * If so, advance past it. If not, do not advance.<a name="line.118"></a>
<span class="sourceLineNo">119</span>     *<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * @param prefix literal string to try to match against the current input<a name="line.120"></a>
<span class="sourceLineNo">121</span>     * @return whether the current input matched {@code prefix}<a name="line.121"></a>
<span class="sourceLineNo">122</span>     */<a name="line.122"></a>
<span class="sourceLineNo">123</span>    public boolean tryLiteral(String prefix) {<a name="line.123"></a>
<span class="sourceLineNo">124</span>        final boolean match = this.input.startsWith(prefix, this.index);<a name="line.124"></a>
<span class="sourceLineNo">125</span>        if (match)<a name="line.125"></a>
<span class="sourceLineNo">126</span>            this.index += prefix.length();<a name="line.126"></a>
<span class="sourceLineNo">127</span>        return match;<a name="line.127"></a>
<span class="sourceLineNo">128</span>    }<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span>    /**<a name="line.130"></a>
<span class="sourceLineNo">131</span>     * Determine if the current input starts with the given regular expression.<a name="line.131"></a>
<span class="sourceLineNo">132</span>     * If so, advance past it and return a successful {@link Matcher}; otherwise, return null.<a name="line.132"></a>
<span class="sourceLineNo">133</span>     *<a name="line.133"></a>
<span class="sourceLineNo">134</span>     * @param pattern regular expression to match against input<a name="line.134"></a>
<span class="sourceLineNo">135</span>     * @return match if successful, null if not<a name="line.135"></a>
<span class="sourceLineNo">136</span>     */<a name="line.136"></a>
<span class="sourceLineNo">137</span>    public Matcher tryPattern(String pattern) {<a name="line.137"></a>
<span class="sourceLineNo">138</span>        return this.tryPattern(Pattern.compile(pattern));<a name="line.138"></a>
<span class="sourceLineNo">139</span>    }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span>    /**<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * Determine if the current input starts with the given regular expression.<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * If so, advance past it and return a successful {@link Matcher}; otherwise, return null.<a name="line.143"></a>
<span class="sourceLineNo">144</span>     *<a name="line.144"></a>
<span class="sourceLineNo">145</span>     * @param regex regular expression to match against input<a name="line.145"></a>
<span class="sourceLineNo">146</span>     * @return match if successful, null if not<a name="line.146"></a>
<span class="sourceLineNo">147</span>     */<a name="line.147"></a>
<span class="sourceLineNo">148</span>    public Matcher tryPattern(Pattern regex) {<a name="line.148"></a>
<span class="sourceLineNo">149</span>        final Matcher matcher = regex.matcher(this.getInput());<a name="line.149"></a>
<span class="sourceLineNo">150</span>        if (!matcher.lookingAt())<a name="line.150"></a>
<span class="sourceLineNo">151</span>            return null;<a name="line.151"></a>
<span class="sourceLineNo">152</span>        this.index += matcher.end();<a name="line.152"></a>
<span class="sourceLineNo">153</span>        return matcher;<a name="line.153"></a>
<span class="sourceLineNo">154</span>    }<a name="line.154"></a>
<span class="sourceLineNo">155</span><a name="line.155"></a>
<span class="sourceLineNo">156</span>    /**<a name="line.156"></a>
<span class="sourceLineNo">157</span>     * Determine if we are at the end of the input.<a name="line.157"></a>
<span class="sourceLineNo">158</span>     */<a name="line.158"></a>
<span class="sourceLineNo">159</span>    public boolean isEOF() {<a name="line.159"></a>
<span class="sourceLineNo">160</span>        return this.index &gt;= this.input.length();<a name="line.160"></a>
<span class="sourceLineNo">161</span>    }<a name="line.161"></a>
<span class="sourceLineNo">162</span><a name="line.162"></a>
<span class="sourceLineNo">163</span>    /**<a name="line.163"></a>
<span class="sourceLineNo">164</span>     * Read and advance past the next character.<a name="line.164"></a>
<span class="sourceLineNo">165</span>     *<a name="line.165"></a>
<span class="sourceLineNo">166</span>     * @return the next character of input<a name="line.166"></a>
<span class="sourceLineNo">167</span>     * @throws IllegalArgumentException if there are no more characters<a name="line.167"></a>
<span class="sourceLineNo">168</span>     */<a name="line.168"></a>
<span class="sourceLineNo">169</span>    public char read() {<a name="line.169"></a>
<span class="sourceLineNo">170</span>        char ch = this.peek();<a name="line.170"></a>
<span class="sourceLineNo">171</span>        this.index++;<a name="line.171"></a>
<span class="sourceLineNo">172</span>        return ch;<a name="line.172"></a>
<span class="sourceLineNo">173</span>    }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span>    /**<a name="line.175"></a>
<span class="sourceLineNo">176</span>     * Read, but do not advance past, the next character.<a name="line.176"></a>
<span class="sourceLineNo">177</span>     *<a name="line.177"></a>
<span class="sourceLineNo">178</span>     * @return the next character of input<a name="line.178"></a>
<span class="sourceLineNo">179</span>     * @throws IllegalArgumentException if there are no more characters<a name="line.179"></a>
<span class="sourceLineNo">180</span>     */<a name="line.180"></a>
<span class="sourceLineNo">181</span>    public char peek() {<a name="line.181"></a>
<span class="sourceLineNo">182</span>        try {<a name="line.182"></a>
<span class="sourceLineNo">183</span>            return this.input.charAt(this.index);<a name="line.183"></a>
<span class="sourceLineNo">184</span>        } catch (StringIndexOutOfBoundsException e) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>            throw this.buildException("truncated input");<a name="line.185"></a>
<span class="sourceLineNo">186</span>        }<a name="line.186"></a>
<span class="sourceLineNo">187</span>    }<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>    /**<a name="line.189"></a>
<span class="sourceLineNo">190</span>     * Push back the previously read character.<a name="line.190"></a>
<span class="sourceLineNo">191</span>     *<a name="line.191"></a>
<span class="sourceLineNo">192</span>     * @throws IllegalStateException if the beginning of the original string has been reached<a name="line.192"></a>
<span class="sourceLineNo">193</span>     */<a name="line.193"></a>
<span class="sourceLineNo">194</span>    public void unread() {<a name="line.194"></a>
<span class="sourceLineNo">195</span>        if (this.index == 0)<a name="line.195"></a>
<span class="sourceLineNo">196</span>            throw new IllegalStateException();<a name="line.196"></a>
<span class="sourceLineNo">197</span>        this.index--;<a name="line.197"></a>
<span class="sourceLineNo">198</span>    }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span>    /**<a name="line.200"></a>
<span class="sourceLineNo">201</span>     * Read and advance past the next character, which must match {@code ch}.<a name="line.201"></a>
<span class="sourceLineNo">202</span>     *<a name="line.202"></a>
<span class="sourceLineNo">203</span>     * @param ch the expected next character of input<a name="line.203"></a>
<span class="sourceLineNo">204</span>     * @throws IllegalArgumentException if there are no more characters or the<a name="line.204"></a>
<span class="sourceLineNo">205</span>     *  next character read is not {@code ch}<a name="line.205"></a>
<span class="sourceLineNo">206</span>     */<a name="line.206"></a>
<span class="sourceLineNo">207</span>    public void expect(char ch) {<a name="line.207"></a>
<span class="sourceLineNo">208</span>        if (this.read() != ch) {<a name="line.208"></a>
<span class="sourceLineNo">209</span>            this.unread();<a name="line.209"></a>
<span class="sourceLineNo">210</span>            throw buildException("expected `" + ch + "'");<a name="line.210"></a>
<span class="sourceLineNo">211</span>        }<a name="line.211"></a>
<span class="sourceLineNo">212</span>    }<a name="line.212"></a>
<span class="sourceLineNo">213</span><a name="line.213"></a>
<span class="sourceLineNo">214</span>    /**<a name="line.214"></a>
<span class="sourceLineNo">215</span>     * Skip leading whitespace, if any.<a name="line.215"></a>
<span class="sourceLineNo">216</span>     *<a name="line.216"></a>
<span class="sourceLineNo">217</span>     * @see Character#isWhitespace<a name="line.217"></a>
<span class="sourceLineNo">218</span>     */<a name="line.218"></a>
<span class="sourceLineNo">219</span>    public void skipWhitespace() {<a name="line.219"></a>
<span class="sourceLineNo">220</span>        while (this.index &lt; this.input.length() &amp;&amp; Character.isWhitespace(this.input.charAt(this.index)))<a name="line.220"></a>
<span class="sourceLineNo">221</span>            this.index++;<a name="line.221"></a>
<span class="sourceLineNo">222</span>    }<a name="line.222"></a>
<span class="sourceLineNo">223</span><a name="line.223"></a>
<span class="sourceLineNo">224</span>    /**<a name="line.224"></a>
<span class="sourceLineNo">225</span>     * Clone this instance.<a name="line.225"></a>
<span class="sourceLineNo">226</span>     */<a name="line.226"></a>
<span class="sourceLineNo">227</span>    public ParseContext clone() {<a name="line.227"></a>
<span class="sourceLineNo">228</span>        try {<a name="line.228"></a>
<span class="sourceLineNo">229</span>            return (ParseContext)super.clone();<a name="line.229"></a>
<span class="sourceLineNo">230</span>        } catch (CloneNotSupportedException e) {<a name="line.230"></a>
<span class="sourceLineNo">231</span>            throw new RuntimeException(e);<a name="line.231"></a>
<span class="sourceLineNo">232</span>        }<a name="line.232"></a>
<span class="sourceLineNo">233</span>    }<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    /**<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * Create a generic exception for rejecting the current input.<a name="line.236"></a>
<span class="sourceLineNo">237</span>     */<a name="line.237"></a>
<span class="sourceLineNo">238</span>    public IllegalArgumentException buildException() {<a name="line.238"></a>
<span class="sourceLineNo">239</span>        return this.buildException(null);<a name="line.239"></a>
<span class="sourceLineNo">240</span>    }<a name="line.240"></a>
<span class="sourceLineNo">241</span><a name="line.241"></a>
<span class="sourceLineNo">242</span>    /**<a name="line.242"></a>
<span class="sourceLineNo">243</span>     * Create an exception for rejecting the current input.<a name="line.243"></a>
<span class="sourceLineNo">244</span>     *<a name="line.244"></a>
<span class="sourceLineNo">245</span>     * @param message problem description, or {@code null} for none<a name="line.245"></a>
<span class="sourceLineNo">246</span>     */<a name="line.246"></a>
<span class="sourceLineNo">247</span>    public IllegalArgumentException buildException(String message) {<a name="line.247"></a>
<span class="sourceLineNo">248</span>        String text = "parse error ";<a name="line.248"></a>
<span class="sourceLineNo">249</span>        String bogus = getInput();<a name="line.249"></a>
<span class="sourceLineNo">250</span>        if (bogus.length() == 0)<a name="line.250"></a>
<span class="sourceLineNo">251</span>            text += "at end of input";<a name="line.251"></a>
<span class="sourceLineNo">252</span>        else {<a name="line.252"></a>
<span class="sourceLineNo">253</span>            if (bogus.length() &gt; MAX_REJECT_QUOTE)<a name="line.253"></a>
<span class="sourceLineNo">254</span>                bogus = bogus.substring(0, MAX_REJECT_QUOTE - 3) + "...";<a name="line.254"></a>
<span class="sourceLineNo">255</span>            text += "starting with `" + bogus + "'";<a name="line.255"></a>
<span class="sourceLineNo">256</span>        }<a name="line.256"></a>
<span class="sourceLineNo">257</span>        if (message != null)<a name="line.257"></a>
<span class="sourceLineNo">258</span>            text += ": " + message;<a name="line.258"></a>
<span class="sourceLineNo">259</span>        return new IllegalArgumentException(text);<a name="line.259"></a>
<span class="sourceLineNo">260</span>    }<a name="line.260"></a>
<span class="sourceLineNo">261</span><a name="line.261"></a>
<span class="sourceLineNo">262</span>    @Override<a name="line.262"></a>
<span class="sourceLineNo">263</span>    public boolean equals(Object obj) {<a name="line.263"></a>
<span class="sourceLineNo">264</span>        if (obj == null || obj.getClass() != this.getClass())<a name="line.264"></a>
<span class="sourceLineNo">265</span>            return false;<a name="line.265"></a>
<span class="sourceLineNo">266</span>        final ParseContext that = (ParseContext)obj;<a name="line.266"></a>
<span class="sourceLineNo">267</span>        return this.input.equals(that.input) &amp;&amp; this.index == that.index;<a name="line.267"></a>
<span class="sourceLineNo">268</span>    }<a name="line.268"></a>
<span class="sourceLineNo">269</span><a name="line.269"></a>
<span class="sourceLineNo">270</span>    @Override<a name="line.270"></a>
<span class="sourceLineNo">271</span>    public int hashCode() {<a name="line.271"></a>
<span class="sourceLineNo">272</span>        return this.input.hashCode() ^ this.index;<a name="line.272"></a>
<span class="sourceLineNo">273</span>    }<a name="line.273"></a>
<span class="sourceLineNo">274</span>}<a name="line.274"></a>
<span class="sourceLineNo">275</span><a name="line.275"></a>




























































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